US3092303A - Bag - Google Patents

Description

J1me 1963 E. H. WOERNER 3,

BAG

Filed 001;. 5, 1961 s Sheets-Sheet 1 June 4, 1963 E. H. WOERNER BAG 3 Sheets-Sheet 2 Filed Oct. 5, 1961 FIG .7.

9 P IN! .illT 4 G a, 7 v I s w c F June 4, 1963 E. H. WOERNER 3,092,303

BAG

Filed Oct. 5, 1961 3 Sheets-Sheet 3 United States Patent enemas BAG Eldon H. Woerner, Peoria, Ilh, assignor to Bemis Bro. Bag Company, St. Louis, Mo, a corporation of Missouri Filed Oct. 5, 1961, Ser. No. 143,246 1 Claim. (Cl. 229-625) This invention relates to bags, and more particularly to multiwall paper bags having a valve at one of the corners thereof adapted to be closed after the bag has been filled.

Among the several objects of this invention may he noted the provision of a bag (which may be either a pasted bag or a sewn bag) having an improved valve construction adapted to be securely closed after the bag is filled; the provision of a valve bag having a valve sleeve which is provided with means for conveniently sealing the sleeve after the bag has been filled; the provision of a valve bag with a sleeve such as described as to which the sealing means is protected until the bag has been filled, after which the sealing means may be readily exposed for eifecting sealing of the sleeve; and the provision of valve bags such as described which are economical to manufacture. Other objects and features will be in part apparent and in part pointed out hereinafter.

The invention accordingly comprises the constructions hereinafter described, the scope of the invention being indicated in the following claim.

In the accompanying drawings, in which several of various possible embodiments of the invention are illustrated,

FIG. 1 is a view in elevation of a pasted valve bag of this invention as it appears with the upper end thereof opened up for the formation of a pasted closure, the central portion of the bag being removed to reduce the height of the view, the position of the valve sleeve being indicated in dotted lines;

FIG. 2 is a plan view of a blank to be formed into a sleeve to be incorporated in the bag;

FIG. 3 is an enlarged section taken on line 3--3 of FIG. 2;

FIG. 4 is a trimetric view of the sleeve after it has been formed from the FIG. 2 blank;

FIG. 5 is a view in elevation showing the completed top closure;

FIG. 6 is a section taken on line 66 of FIG. 5, showing the sleeve spread open, and before sealing;

FlG. 7 is a section similar to FIG. 6 showing the sleeve flattened and sealed;

FIG. 8 is a view in elevation of a sewn valve bag having a so-called intuck sleeve of this invention;

FIG. 9 is a plan view of a blank to be formed into a sleeve such as is incorporated in the FIG. 8 bag;

FIG. 10 is a trimetric view showing the sleeve of the FIG. 8 sewn bag spread open;

FIG. 11 is a section taken on line 1l11 of FIG. 10; and,

FIG. 12 is a trimetric view showing the appearance of the valve corner of the FIG. 8 bag after filling and sealing, and before tucking in of the valve sleeve.

Corresponding reference characters indicate corresponding parts throughout the several views of the drawings.

Referring first to FIG. 1 of the drawings, there is indicated at 1 a paper bag to be provided with a valve sleeve of this invention. The bag is shown with a pasted bottom closure 2, and its upper end is shown as it appears prior to completion of the formation of a pasted top closure. The bag is a fiat (ungusseted) roag prepared in accordance with conventional bag manufacturing practice, having opposed walls 3 and 5 joined at integral folds 7 of the material which constitute the side edges of the 3,092,303 Patented June 4, 1963 bag. It will be understood that the bag will conventionally be a multiwall paper bag, i.e., a bag made of a plurality of plies of paper, having the usual pasted longitudinal ply seams (not shown).

The top closure for the bag is conventionally formed by opening up the end of the bag and folding to form inwardly directed end flaps 9 and 11 and first and second side flaps "13 and 15, and applying a pattern of paste P. End flap 11 may be referred to as the valve flap, being located at the valve corner of the bog. The paste pattern, as shown, is of U-shape, including stripes extending across the end flaps lengthwise of the bag and a stripe extending across the second side flap 15 transversely of the bag. Ultimately, the closure is completed by folding over the first side flap 13 on a tranverse fold line 17, and then folding over the second side flap 15 on a transverse fold line 19 to overlie the first side flap. Prior to completing the closure, a valve sleeve S of this invention is applied to flap 11, becoming pasted to flap 11, and flap 13 is folded over on the sleeve.

Sleeve S is formed from a rectangular blank of paper such as indicated at 21 in FIG. 2. This may be kraft paper, for example. In accordance with this invention, a stripe of pressure-sensitive adhesive 23 (see FIG. 3) is applied adjacent one longitudinal edge or side 25 of the blank on one face 27 thereof. Adhesive 23 extends from a point adjacent one end or side 2? of the blank 21 to the other end or side 31 thereof. A protective strip 33, of a conventional plastic-coated paper which adheres lightly to the adhesive but which is adapted readily to be peeled away from the adhesive, is applied over the stripe of adhesive 23 and extends a short distance beyond the end 31 of the blank to provide a free end 35. The blank 21 is folded on transverse lines 37 and 39 to bring the ends of the blank into overlapping relation thereby to form sleeve S with the strip 33 and its free end 35 on the inside of the sleeve as shown in FIG. 4, with end 31 on the inside of the overlap.

The sleeve S is positioned on valve flap 11 wtih its end having adhesive 23 and strip 33 thereon located generally along a line extending between the right-hand ends of the fold lines 17 and 19, with the sleeve extending inward over and past the inner end of flap 11. Then side flap 13 is folded over on the sleeve and end flap 9, and flap 15 is folded over on flap 13 (see FIGS. 5 and 6).

The bag 1 is adapted to be filled by entering a filling spout in sleeve S and blowing material with which the bag is to be filled (such as a pulverized or granulated material) into the bag through the spout. Strip 33 protects the adhesive during the filling operation. After the bag has been filled and the spout removed, the free end 35 of the protective strip 33 is grasped and the strip pulled off adhesive 23. The upper half of the folded sleeve is then pressed down upon the lower half thereof to cause the opposite exposed portions of adhesive 23 to adhere together, thus sealing the sleeve as illustrated in FIG. 7.

A sewn bag 41 having a valve of this invention is illus trated in FIG. 8. Bag 41 has gusset sides 43- and sewn bottom and top closures generally designated 45 and 47. Each closure conventionally comprises a line of stitching 49 and an overlying folded tape 51. At one top corner of the bag is a tucked-in valve flap 53. A sleeve S1 is provided on valve flap 53. Sleeve S1 is a tuck-in sleeve, i.e., a sleeve which extends out of the bag at the valve corner of the bag, an outer part of the sleeve being folded under and tucked in between the remainder of the sleeve and valve flap 53 after the bag has been filled. Sleeve S1 is also a so-called cuffed sleeve, having a cufi C pasted at P1 (see FIG. 11) to the inner end of valve flap 53 in such manner as to provide ample space underneath the sleeve for tucking in the folded outer portion of the sleeve.

Sleeve S1 is formed from a generally rectangular blank 55 of paper such as shown in FIG. 9.

A stripe of pressure-sensitive adhesive 23a (see FIG. 11) is applied adjacent one longitudinal edge 57 of the blank 55 on vone face 59 thereof. Adhesive 23a extends fromta point 61 near but spaced from one end 63 (the upper end as viewed in FIG. 9) of the blank to the other end 65 thereof. Protective strip 33a covers adhesive 23a and extends from end 65 past the upper end of adhesive 23a a short distance to provide a free end 35a.

Blank 55 is folded on a transverse center line 67 to bring the ends of the blank coextensive with each other with the adhesive 23a and strip 33a on the inside of the folded blank. The cuff C of blank 55 is formed by folding the cuff back on a longitudinal line 69. The blank 55is positioned on valve flap 53 with culf C overlying the margin of flap 53 at the inner end of flap 53 with the blank extending outward over flap 53. As previously stated, cufi C is adhered to the flap by paste at P1. The upper margins of the folded blank, including the end of the protective strip 33a at end 65 of the blank, are caught in the top closure to form sleeve S1. Free end 35a of the strip 33a is not caught in the sewing.

After the bag 41 has been filled and the spout removed, free end 35a is grasped and strip 33a is stripped from adhesive 23a. The needle holes and thread extending through the end of strip 33a caught in the closure weaken the strip to such an extent that it will'tear off along this weakened area when strip 33a is pulled. The sleeve S1 is spread horizontally flat as shown in FIG. 12, and its outer end is pressed to effect sealing thereof by adhesive 23a, and then folded down and tucked undereneath the inner portion'of the sleeve.

'In view of the above, itwill be seen that the several objects of the invention are achieved and other advantageous results attained. a

e As various changes could be made in the above constructions without departing from the scope of the invention, it is intended that all matter contained in the above descripion or shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense. What is claimed is: i

A bag having a pasted closure at one end thereof, said closure including inwardly directed end flaps at the corners of the bag at said one end thereof, a first side flap overlying the end flaps and a second side flap overlying the first side, one of said end flaps constituting a valve flap, a flat valve sleeve secured to the valve flap, said sleeve being constituted by a generally rectangular blank of sleeve material having a stripe of pressure-sensitive adhesive extending generally parallel to and adjacent a first of the four sides of the blank and a protective strip overlying the' stripe of adhesive, said strip having a free end portion extending beyond a second side of the blank which is generally-perpendicular to said first side, said blank together withthe protective strip being folded to form the sleeve on two fold lines extending generally perpendicular to its said first side, with the stripe of adhesive and the protective strip on the inside of the sleeve and extending around the inside of the sleeve at one end of the sleeve constituting its outer end, said fold lines beingso located that the margin of the blank along said second side of the blank and the opposite margin of the blank lie in overlapping relation extending generally centrally lengthwise of one face of the sleeve with the margin of the blank along the second side of the blank on the inside so that said free end portion of said protective strip projects laterally beyond said inside margin on the inside of the sleeve, and said sleeve having its said one face which includes the overlapping margins of the blank secured to the valve flap with the protective strip at the outer end of the sleeve and adapted to be removed after the bag has been filled through the sleeve by grasping its free end portion and pulling it, thereby to permit the outer end of the sleeve to be sealed by the adhesive, said strip preventing sticking of the sleeve and protecting the adhesive from becoming fouled by material with which the bag is tilled prior to the removal of the strip.

References Cited in the file of this patent UNITED STATES PATENTS Amiguet Ian. 7, 1958

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